Then the bruises started appearing, large ones that wouldn't go away for weeks.

"She just changed a lot, and she'd never slept much as a baby but then started sleeping for three hours straight."

Multiple visits to the GP later, and the Sydney mum still didn't know what her daughter was suffering from.

She just knew something was terribly, terribly wrong.

Charlotte in hospital being treated for leukaemia. Image: Provided

"She had gastro, so she had a fever and she was vomiting.

"I took her to the GP on the Tuesday and was told it was a virus and to keep up the fluids and she'd be fine.

"By Friday she wasn't breastfeeding," the mother-of-two said.

(Provided)

Charlotte endured six months of gruelling treatment. Image: Provided

"I remember thinking she doesn't look like my child anymore. She was really sick. That's when I took her to Mona Vale Hospital."

A nurse at the hospital questioned Danielle about Charlotte's diet because she was so pale, but after numerous tests, the worried parents were told their daughter had leukaemia.

"It was 10 o'clock at night when the doctor told us there was something seriously wrong with her blood and the paediatrician came back in and said from what he could see, Charlotte had leukaemia.

"It was like the world just stopped."

(Provided)

Danielle said she didn't know if her daughter would survive. Image: Provided

"I didn't know if she'd live, and she was so, so sick, and they'd had to give her blood and platelet transfusions really quickly," she said.

The family were immediately transferred to Sydney Children's Hospital in Randwick via ambulance.

Charlotte underwent a bone marrow biopsy to figure out what type of leukemia she had. She had AML, the worst, most aggressive kind.

"They were going through all the treatment she would have to have - chemo, the whole protocol.

"I thought I'd done all the right things - I'd breastfed her, only given her organic food, and then they're telling me they're going to be putting all of this poison into her body and I told them I didn't want them to, that I wanted to take her home.

"They said, 'If you take her home, she will die. There's no alternative. This is the only chance she has to survive.'"

(Provided)

Charlotte is now nine, and brother Dylan is six. Image: Provided

Charlotte underwent six months of intensive treatment including chemo injections directly into her spinal column and a stem cell transplant.

"During her treatment she had to be kept away from other kids so she wouldn't get sick," Danielle explained.

"After the initial treatment she was in weekly for blood tests, then that went to monthly by the time she started school."

Charlotte was officially deemed to be in remission in February 2010, and now, her mum says she's in perfect health.

"I still panic when she gets bruises or a fever, but aside from that, I look at her and can't believe she is so healthy and well. She's also very strong-willed."

Charlotte and her family have just been announced as the family ambassadors of the Balmoral Swim for Cancer - an open water race in Sydney Harbour, which is being held on Sunday 18th March 2018 to raise money for the Children's Cancer Institute.